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The chain in use on modern bicycles has a 1 ⁄ 2 inch (12.7 mm) pitch, which is the distance from one pin center to another, ANSI standard #40, where the 4 in "#40" indicates the pitch of the chain in eighths of an inch; and ISO standard 606 (metric) #8, where the 8 indicates the pitch in sixteenths of an inch.
Jockey wheel or Pulley wheel: one of two small sprockets of the rear derailleur that guides the chain; Kickstand: a folding attachment used for assisting a bicycle to ...
A typical bicycle chain (for derailleur gears) uses narrow 1 ⁄ 2-inch-pitch chain. The width of the chain is variable, and does not affect the load capacity. The more sprockets at the rear wheel (historically 3–6, nowadays 7–12 sprockets), the narrower the chain.
12.7 mm = 0.5 inch width, 38° pulley angle imperial belts B: 17 mm: 11 mm: 40° 16.5 mm = 21/32 inch width, 38° angle imperial belts C: 22 mm: 14 mm: 40° 22.2 mm = 7/8 inch width, 38° angle imperial belts D: 32 mm: 19 mm: 40° 31.75 mm = 1.25 inch width, 38° angle imperial belts E: 38 mm: 25 mm: 40° 38.1 mm = 1.5 inch width, 38° angle ...
A block and tackle [1] [2] or only tackle [3] is a system of two or more pulleys with a rope or cable threaded between them, usually used to lift heavy loads.. The pulleys are assembled to form blocks and then blocks are paired so that one is fixed and one moves with the load.
A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain. The earliest evidence of pulleys dates back to Ancient Egypt in the Twelfth Dynasty (1991–1802 BC) [1] and Mesopotamia in the early 2nd millennium BC. [2]
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